The intensity limits for BC transducers compared to air conduction are:

Bone conduction (BC) transducers work by bypassing the outer and middle ear and stimulating the cochlea directly through vibrations transmitted to the skull. In contrast, air conduction (AC) transducers transmit sound waves through the air to the outer ear canal. The intensity limits for BC transducers are often compared to those of air conduction because the way sound is perceived through these methods varies.

The reason why the correct answer is that the intensity limits are at the same levels is based on the fundamental response of the auditory system to different types of stimuli. Although BC may have different mechanisms of transmitting sound, when evaluated, the thresholds of hearing implied by BC signals can effectively align with those of AC signals at comparable frequencies—especially in the mid-range frequencies, where human hearing is most sensitive.

In clinical practices, while there may be variations in specific conditions or individual responses to stimulus types, the general ability to perceive sound through bone conduction can be effectively equated to air conduction on average, thus supporting the indication that limits can be considered similar in established assessments under controlled conditions.